A population Model The population of the World in 2014 was 7.14 billion people and was growing at a rate of 1.1% per year. Assuming that this growth continues, the model P ( t ) = 7.14 ( 1.011 ) t − 2014 represents the population P (in billions of people) in year t . According to this model, when will the population of the Worldbe 9 billion people? According to this model, when will the population of the Worldbe 12.5 billion people?
A population Model The population of the World in 2014 was 7.14 billion people and was growing at a rate of 1.1% per year. Assuming that this growth continues, the model P ( t ) = 7.14 ( 1.011 ) t − 2014 represents the population P (in billions of people) in year t . According to this model, when will the population of the Worldbe 9 billion people? According to this model, when will the population of the Worldbe 12.5 billion people?
Solution Summary: The author explains that the population of the world in 2014 was 7.14 billion people and was growing at a rate of 1.1% per year
A population Model The population of the World in 2014 was 7.14 billion people and was growing at a rate of 1.1% per year. Assuming that this growth continues, the model
P
(
t
)
=
7.14
(
1.011
)
t
−
2014
represents the population
P
(in billions of people) in year
t
.
According to this model, when will the population of the Worldbe 9 billion people?
According to this model, when will the population of the Worldbe 12.5 billion people?
Trolley of the overhead crane moves along the bridge rail. The trolley position is
measured from the center of the bridge rail (x = 0) is given by x(t) = 0.5t^3-6t^2+19.5t-14 : 0 <= t <= 3 min. The
trolley moves from point A to B in the forward direction, B to C in the reverse direction and C to D again in the
forward direction.
CONTROL PANEL
END TRUCK-
RUNWAY BEAM-
BRIDGE RAIL
HOIST
-TROLLEY
TROLLEY BUMPER
TROLLEY DRIVE
LPENDANT TRACK
-TROLLEY CONDUCTOR
TRACK
WIRE ROPE
-HOOK BLOCK
-BRIDGE DRIVE
-END TRUCK BUMPER
-RUNWAY RAIL
TROLLEY END STOP
-CONDUCTOR BAR
PENDANT FESTOONING
TROLLEY FESTOONING
PENDANT CABLE
PENDANT
x(t)=0.5t^3-6t^2+19.5t-14
v(t)=1.5t^2-12t+19.5
a(t)=(dv(t))/dt=3t-12
Fig. T2.2: The overhead crane
Total masses of the trolley, hook block, and the load attached to the hook block are 110 kg, 20
kg, and 150 kg. Damping coefficient, D, is 40 kg/s.
What is the total amount of energy required from the trolley motor to move the system
[Hint: Use Newton's 2nd law to obtain the…
CONTROL PANEL-
BRIDGE RAIL
HOIST
-TROLLEY
TROLLEY BUMPER
-BRIDGE DRIVE
END TRUCK-
RUNWAY BEAM-
END TRUCK BUMPER
-RUNWAY RAIL
TROLLEY DRIVE
TROLLEY END STOP
-CONDUCTOR BAR
LPENDANT TRACK
TROLLEY CONDUCTOR
TRACK
-WIRE ROPE
PENDANT FESTOONING
TROLLEY FESTOONING
-PENDANT CABLE
-HOOK BLOCK
PENDANT
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